On 31.05.2011, at 14:35, Paul Mackerras wrote:

On Tue, May 31, 2011 at 12:40:31PM +0200, Alexander Graf wrote:
=20

quoted

Thinking about the testability of this a bit more ... how much
effort would it be to get this code running on a 970MP with SLOF?
There should only be a few POWER7 specific pieces, right?

=20
Do you have a 970MP that has a usable hypervisor mode, i.e. not an
Apple machine?  The 970s in Apple machines have the HV hard-wired to
1, which means they do have a hypervisor mode but it isn't any use.
=20
If you do have such a machine, then we would have to look at some
details like the instruction sequence for the partition switch, and
make sure we don't try to use SMT4 mode.  Also, I believe we will have
to flush the TLB on partition switches, since Power processors prior
to POWER7 didn't tag the TLB entries with the partition ID.
=20
So it should be quite feasible if you have a non-Apple machine.
I will check whether the 970MP machines that Terrasoft were
distributing would be suitable.  We have one of them in the lab.

That's the one I was thinking of and yes, I have one available. That way =
I could test 99% of your code, you don't have to release hardware, and =
everyone's happy :).


Alex